Image Sharpening

Peter10d

Peter10d

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Peter
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I have only recently started shooting in RAW, and using Canon's own DPP software. Already converted as to what I have been missing by shooting JPEG, insted of RAW (apart from the time factor). What is confusing me, is with the ability of the sharpening tool, which even appears to work very well on JPEG's, I struggle to find to see a reason for spending a fortune on high end spec lenses, to achieve ' sharper results '. I am sure there must be a reason (other than the other benefits of expensive lenses, namely a faster lens etc), is it maybe when the image is enlarged ? For info, I have been using a Sigma 17-35 ex dg, which I had planned to upgrade to Canon 17-40L, but I am now unsure if it would be worth it.
 
In a nutshell...

You can't sharpen what isn't there.

Having said that, generally beyond a certain price level you're acquiring 'build quality' and longevity of lens life rather than substantial increases in image quality.

Another option available to you is to speak to Stewart at Lens for Hire and hire the 17-40L to see whether or not you like it....

Oh look! Here's one I prepared earlier....

http://www.lensesforhire.co.uk/canon-ef-17-40mm-f4-l-usm-27-p.asp

-Rob
 
A high quality, sharp optic will always give a better result than a crap optic that's image is sharpened.

The 17-40 is worth every single penny. A classic lens
 
You also have to remember that there is a limit to how much sharpening you can apply in PP without overdoing it, and actually making the image worse.
 
I see you are shooting with a 10D. very good camera despite it's age. However it does only have a 6 Mp chip, so it's resolution is limited. It's possible that the resolving power of the lens exceeds that of the chip.

The only way you are going to find out is to try one.
 
I would recommend a read of the link below, also there is a lot more useful information on this site too.

http://www.cambridgeincolour.com/tutorials/sharpness.htm

What you need to be careful of is the difference between sharpness and acutance, all you are doing when you sharpening is enhancing the appearance of edges. If the image is out of focus to start with you will never be able to make it focused. You need to be aware of the other impacts that sharpening will have on you image as well such as increasing noise and contrast.


Matt
 
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